[Gmsh] problem with gmsh to Freefem mesh?

Geordie McBain gdmcbain at freeshell.org
Wed May 6 02:19:30 CEST 2015

2015-05-06 2:20 GMT+10:00 Julien Derr <julien.derr at gmail.com>:
> Hi again, I am back again with the same error message!
> but this time I checked that I didn't have twice the same points. He re is
> the problem:
>  What happen is that I have 3 points perfectly aligned, and it seems gmsh is
> making a flat triangle with them.

Hello.  I wouldn't have thought that collinearity would present a
problem, necessarily, depending on how the points are used to define
surfaces.  I wasn't sure that I'd come across this before so created a
simple degenerate quadrilateral, as attached; Gmsh & FreeFem++ seemed
happy enough.
  Or do you mean that the three points are coincident rather than
merely collinear?
  Do you have an exemplary .geo file that you could share?

I agree that having to reduce the characteristic length to avoid the
problem would be inconvenient and undesirable, but I'm hopeful that
there's another way.
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